Blade adjustment for wood planers



Aug. 31, 1943. R. MULLER BLADE ADJUSTMENT FOR WOOD PLANERS Filed May s1, 1941 `Patented Aug. 31, 1943 Vij"lJl-*JITEDj STNIES'l PATENT j BLADE ADJUSTMENTFOR Wool) PLANERS Rudolph Mller, Elizabeth, N. J. Application May-s1, 1941,serial No. 395,898

' i claim. t (ol. 14e-.11)`

My invention relates to means `for adjusting t the cutting bit in wood planers.

l 'I'he `well known difficulties in` the existing means occur when the operator must cease work andwith some difcultyadjust the bit to a par-A ticular extension before each piece is planed.

I have found by experiencethatthe lossof time thus caused is a large proportion of theV total time used by an. operator.

It is clear that themore numerous the jobs are in a day, the more often an artisan is rel tor must cease work, adjust his bit and then after removing the high spot cease work again and re-adjust his bit to proceed with the job.

Again it is a frequent occurrence to find a low spot in a piece being worked. The same loss of time occurs when the j adjustments requisite are eifected.

The principal object of my invention is to provide a construction which will permit the adjusting of the bit with the plane in its working position on the work and the operators hand holding the plane in `its normal position while working. My means of accomplishing the foregoing objects may be more readily understood by having reference to the accompanying drawing which is hereunto annexed and made a part of this specification in which:

Fig. 1 is a vertical sectional elevation showing the interior construction Fig. 2 is a section taken on the line 2-2 in Fig. 1; and

Fig. 3 is a fragmentary detail View showing the modified form of construction. l

Similar reference numerals refer to similar parts throughout the entire specification.

`As shown in the drawing the body I, of the plane is provided with hand grips 2 and 3 adjacent each end. The rear grip being formed by shaping the body of the plane. Between the grips 2 and 3 is a slot in Which is mounted the plane iron or bit 4,`whi`ch rests upon an inclined surface 5, upon which-the plane bit 4 slides when the adjustmentls being made.. A break or chip iron 6 is mounted on the bit in the usual manner and secured thereto, as shown it is fastened with a screw.

A clamping plate I is mounted on the break iron and is heldin position by means of a keyhole slot 8,`in which is mounted a screw 9 which is screwed into the body of the plane. Means to adjust the clamping plate 'I, consists of an adjusting screw I0. An adjusting lever II by means lof which the `cutting edge of the plane iron or bit 4 may be adjusted, all of these parts are of more or less standard practice, Well under#` stood by those skilled in the art so that a detail descriptionis not deemed necessary. Aspointed out in the preamble it is desirable `to provide means for manually varying theextent ofthe projection of the cutting edge of the plane iron or bit in relation to the bottom of the plane body.

One means by which I accomplish this is clearly shown in Figs. 1 and 2 which shows a compartment formed in the body of the plane adjacent but below the inclined surface 5 upon which slides the bit 4.

In this compartment it will be seen I provide an arm I2 which is pivotally mounted upon pin I3. `The arm I2 is provided at its upper end with a lug I4 which extends into a slot-l I5 provided in the break iron 6 for its reception. The other end of the arm is bifurcated, the prongs I6 and II engaging a crank arm I8 which is fixedly mounted on a toothed wheel I9. This wheel is rotatable upon an axle 2D mounted in any suitable or convenient manner in the body I of the plane as shown in Fig. 2 a metal wall is mounted abutting the rear wall of the compartment to which the axle 20 is fastened. It will be obvious that rotation of the wheel I9 will carry with it the crank arm I8 this in turn will cause the lug I4 to abut the edges of the slot I5 move the bit` 4 in or out of the body I of the plane in accordance with the direction of rotation of the wheel.

My means of rotating the wheel I9 comprises .a pinion 2I which is very much smaller than the gear wheel I9 thereby affording an exceedingly minute adjustment of the cutting edge of the bit carried by a shaft 22 which may be journaled in a plate 23. A collar 24 mounted on the shaft 22 serves to hold the pinion 2| in mesh with the teeth on the wheel I9. The plate 23 may be secured to the body I of the plane by screws 25 or in any other desired manner and closes the opening into the compartment.

Upon the end of the shaft 22 I mount a disk t 26 the periphery of which is preferably knurled so as to provide a convenient gripping surface for the users nger to rotate the disk 26. 'I'he rotation of which Will move the pinion 2|, which will in.' turn move the Wheel i9 in either a clock-r wise or counterclockwise direction and in that manner advance or retract the break iron 6, which being fastened to the bit, Will project or Withdraw the cutting edge of the bit 4 through the coaction of the crank arm I8 and the lug I4 on the pivoted arm l2. y

' It Will be obvious from the foregoing descrip tion, that by the use of this means of adjusting the position of the cutting edge of the bil-,.4 the varying conditions abovefreferred to in the Work can be met Without the'slightest loss of time to adjust the position of the bit 4.

In Fig. 3, I have shown a preferred form in' which I have substituted for the pivoted arm llZ" a linkage consisting of a pair of links Sil andill, the inner ends of Which are pivotally' attached',

the link30 has a lug 32 which is adapted to -fitt in the slot l5 in the same manner as the lug M on the pivoted arm I2. The end 33 of link 3lis secured to the cra-nk arm i8, thus it will be seen-that if the wheel I9 is oscillatedthe links-y Will be shifted. and the lug 32 will move the bit .llr

be Very satisfactory, andI do not Wishfto be.

understood as limiting myself therebyv except :as such limitations may appear-in the hereinafter appended claim.

Having described my invention what I regard as new and desire to secure by Letters Patent is:

In a plane, a plane body the rear end of which extends upwardly to form a hand grip said body having a bit slot therein provided with an inclined surface. and an opening in the side of the plane body leading to a compartment beneath the inclined surface and adjacent thereto, a bit mounted in said slot upon said inclined surface anda break .iron secured. to.said.bit,. there being a slot in saidlbreak iron; an axle secured to the inner Wall of said compartment, a gear Wheel rotatably mounted thereon, a laterally extending pin eccentrically secured to said Wheel, a pin 'xedly mounted. in said body adjacent the bit and extending parallel to said axle, a line one lend of which extends into and abuts the end Walls ofthe. slot .in theV break iron, a second link one end ofwhich is pivotally attached to the first named link, its other end rotatably engaging said pin,A a plate Which-closes the openingpto said compartment, a rotatable'shaft jo-urnaled in saidl plate, a. pinion Which/ engages the teeth-.of said gearrcarriediby said shaft, a knurled` disk on the outer end of said shaft wherebyy the pinion and in turnthe ygea-r may be oscillated` and the posif tion' of the break iron andH bit shifted: to adjusted position.

RUDOLPH MLLER. 

